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Abstract: The current theoretical and experimental situations are reviewed forlow-dimensional insulating systems with a low magnetic transition temperatureTM and pronounced short-range magnetic order above this temperature. Both thestandard and self-consistent spin-wave theories are shown to be insufficient toquantitatively describe the experimental data on these systems.Field-theoretical approaches taking into account the contribution of thespin-fluctuation excitations neglected in the spin-wave theories to thethermodynamic properties of ferro- and antiferromagnets are discussed.



Autor: A A Katanin, V Yu Irkhin

Fuente: https://arxiv.org/







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